Is the top or the bottom of the Grand Canyon older?

Grand Canyon's Rock Layers The oldest layers, which formed first, are usually at the bottom, while the younger layers are stacked on top. Sedimentary rocks form the middle and top layers of Grand Canyon. Layers of sediment hardened into sedimentary rocks over time.



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Remember, the oldest rocks in Grand Canyon are 1.8 billion years old. The canyon is much younger than the rocks through which it winds. Even the youngest rock layer, the Kaibab Formation, is 270 million years old, many years older than the canyon itself. Geologists call the process of canyon formation downcutting.

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The composition (sandstone) and presence of stromatolites indicate that this area was previously a very shallow sea. The rock layers in the Grand Canyon Supergroup have been tilted, whereas the other rocks above this set are horizontal.

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Despite these strategically located private in-holdings, the vast majority of the Grand Canyon is owned by the federal government, held in trust for the American people and managed by a varied collection of federal agencies. Indian reservations, state land, and private land surround these federal lands.

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Carved by the Colorado River and other geological forces, it is 277 miles long, up to 18 miles wide, and a mile deep. Nearly five million people visit the canyon annually, but as we later learned, only about one percent of them hike all the way to the bottom, as we planned to do.

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The mystery of the Great Unconformity What's tricky about the Grand Canyon is that the rocks in its walls seem to be missing a big part of the picture. In 1869, a man named John Wesley Powell observed that several layers of rock that should've been in the Canyon walls were not present.

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09:41 And, right at the bottom, you find the granddaddy of Grand Canyon rocks, granodiorite. This rock is more than 4,000 feet below the rim of the canyon, and it's one of the oldest rocks of them all.

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About 900 people have died in the Grand Canyon. The leading cause of death is airplane and helicopter crashes, followed by falling from cliffs, environmental deaths (such as overheating), and drowning. On average, about 11 people die per year in the Grand Canyon.

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The rock that makes up the canyon walls is vastly more ancient than the dinosaurs – about a billion years more ancient, in some cases – but the canyon itself probably didn't form until after the dinosaurs were long gone.

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Impress Your Friends With These Fun Facts!*
  • We don't really know how old it is. ...
  • Grand Canyon creates its own weather! ...
  • There are no dinosaur bones in the canyon. ...
  • But there are lots of other fossils in the area. ...
  • There's a town down in the canyon. ...
  • We're missing 950 million years worth of rocks!


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Most visitors don't know that you can also drive to the bottom of the canyon! You do so by taking Diamond Creek Road. The route starts in Peach Springs, Arizona, a small town on the historic Route 66. In order to drive on this road to the Grand Canyon, you'll need a permit, as it's on Hualapai land.

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Incised by the Colorado River, the canyon is immense, averaging 4,000 feet deep for its entire 277 miles. It is 6,000 feet deep at its deepest point and 18 miles at its widest. However, the significance of Grand Canyon is not limited to its geology.

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Can you take a helicopter to the bottom of the Grand Canyon South Rim? Helicopters are not permitted to fly to the bottom of the South Rim. However, Papillon does offer helicopter tours that land at the bottom of the West Rim of the Grand Canyon.

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We Are Still Here Indigenous people are the first inhabitants and caretakers of the land that later became the United States of America and Grand Canyon National Park. Native people of this land still exist today and continue to have deep cultural connection to this land.

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“The Havasupai people have actively occupied this area since time immemorial, before the land's designation as a national park and until the park forcibly removed them in 1926. This renaming is long overdue. It is a measure of respect for the undue hardship imposed by the park on the Havasupai people.”

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You cannot walk to Africa from the Grand Canyon though unless you go up through Alaska then into Russia and all the way through Central Asia and into Africa.

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A large sandstone boulder contains several exceptionally well-preserved trackways of primitive tetrapods (four-footed animals) which inhabited an ancient desert environment. The 280-million-year-old fossil tracks date to almost the beginning of the Permian Period, prior to the appearance of the earliest dinosaurs.

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